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The mother of Muriel was a pure-blood witch[1] and a close friends with Bathilda Bagshot. During a conversation with Bathilda, she learned of the altercation between brothers Albus and Aberforth Dumbledore, which had occurred at their sister Ariana's funeral. Unknown to her, Muriel was listening to the discussion from behind the door.

Behind the scenes

Muriel is Molly's aunt. If Muriel was a sister of Mr. or Mrs. Prewett, this woman is Molly's grandmother.